I have just found out that when i use FGCOM and test the microphone, the only sound i hear is a whooshing sound like echoing waves, i dont think the mic is broken because it happens even if i unplug it.$ fgcom.exe -Sfgcom.flightgear.org.uk -i0.5 -o0.5 -p16661 -f910

I'm having exactly the same problem (the console give exactly the same output; extraterrestrial sounds only, when in testing mode (with fq 910)

I checked my system with skype: it works perfectly.

Yesterday I tried fgcom in EDDF: I was capable to ear the other simmer (including atc-jomo ) ... but when I was speaking the listners were reporting a heavy sound disturbance only. So I was kindly asked to give up

I started FGCOM after FG. (In FG I added the following string: --generic=socket,out,10,localhost,16661,udp,fgcom)The FGCOM GUI (in Normal Mode) says:

I too get the loud looping sound on echo test, but no trouble otherwise. This to me is normal because the echo test is picking up its own signal and sending it back, so it comes back with acoustic resonance. Skype and other such software will be bad comparison tests as they usually embed algorithms to filter those out.

You should basically assume FGCom is working if you get this echo at all, or use headphones while you are testing if you want to hear what FGCom does with sound without resonance.